Introduction 2 Mechanical Design

What is mechanical design? 2 Everything is designed except nature The packaging of a Band-Aid The curve of a bike frame The shape of a city street light Mechanical designs incorporate moving components into full assembly Include components like gears, bearings, linkages, screws Static and dynamic design considerations

Components 3 FastenersGears BearingsMotors

Components 4 Bearings Definition: Bearings occur between two materials moving relative to another Objective: Support relative motion to prevent wear, fatigue, etc. All different types Bushing Thrust bearing Roller bearing Ball bearing

Components 5 Definition: Any pair of components that transmits/transforms torque and angular velocity Objective: To transmit torque and angular velocity across components All different types Spur Helical Rack and pinion Planetary Gears

Components 6 Definition: A component which fixes two materials together Objective: To fixture material together and to transmit loads between materials All different types Bolts Screws Nuts Washers Fasteners

Components 7 Definition: A component which transforms electrical to mechanical power Objective: Produce controllable and reliable rotational torque and motion All different types DC motors RC servos Stepper motors Brushless motors Motors

Computer Aided Design (CAD) 8 Used to create 3D models of mechanical designs Various software packages Solidworks ProEngineer SketchUp Integrates various components into a single model Build a perfectly scaled model Import various components Design connections, fastening, assembly, etc. Streamlines design process Ensures fit and tolerances Can be used with rapid prototyping machines

SketchUp 9 Open source CAD software Free and paid versions We will only require to use functions in the free version Download here: Easy to use tutorials Getting Started with SketchUp tutorial today Familiar and Expert in SketchUp for homework Huge library of premade CAD models Download and include in your own models

Get Started With SketchUp – Part 1 10

Rapid Manufacturing 11 Modern manufacturing method which uses CAD models to fabricate physical components Many methods Laser cutters (2D shapes) CAD/CAM machining 3D printing Fused deposition modeling (FDM) Stereolithography Direct metal laser sintering Increases efficiency in manufacturing Allows for impossible geometeries Complexity is free!

Complexity is Free 12 Additive vs. Subtractive Manufacturing Orthogonal classical machining tools Layered geometries

Open Ideas Keep working on more SketchUp tutorials –More advanced techniques will be more and more useful as the semester goes on SketchUp Challenges –Think of an everyday object (i.e. – a toothbrush, a basketball, etc.) and have students race to make the best SketchUp model of it 13